UL 13 Power-Limited Circuit Cables - Types and Applications

The National Electrical Code (NEC) permits the use of lower voltage cables on power-limited circuits as defined in Article 725 of the NEC. Underwriters Laboratories (UL) developed Subject 13 to define the cable constructions and the physical and electrical requirements for cables intended for use on power-limited circuits. Optional protective coverings are also included. A reference is provided to the engineer on the various cable types available, the UL requirements for each, and the NEC requirements for various installations and environments.